有时候在一个项目中会连接多个数据库,需要在spring中配置多个数据源,最近就遇到了这个问题,由于我的项目之前是基于通用Dao的,配置的时候问题不断,这种方式和资源文件冲突;扫描映射文件的话,SqlSessionFactory的bean名字必须是sqlSessionFactory 他读不到sqlSessioNFactory2或者其他名字,最终解决方法如下:
1.在项目中加入如下类MultipleDataSource.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
package com.etoak.util; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; public class MultipleDataSource extends AbstractRoutingDataSource { private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<String>(); public static void setDataSourceKey(String dataSource) { dataSourceKey.set(dataSource); } @Override protected Object determineCurrentLookupKey() { // TODO Auto-generated method stub return dataSourceKey.get(); } } |
spring配置文件如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
< beans xmlns = "http://www.springframework.org/schema/beans" xmlns:context = "http://www.springframework.org/schema/context" xmlns:p = "http://www.springframework.org/schema/p" xmlns:mvc = "http://www.springframework.org/schema/mvc" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> < context:component-scan base-package = "com" /> < mvc:annotation-driven /> < context:property-placeholder location = "classpath:db.properties" /> < bean id = "ds1" class = "org.springframework.jdbc.datasource.DriverManagerDataSource" p:driverClassName = "${mysql.driver}" p:url = "${mysql.url}" p:username = "${mysql.username}" p:password = "${mysql.password}" /> < bean id = "ds2" class = "org.springframework.jdbc.datasource.DriverManagerDataSource" p:driverClassName = "${mysql2.driver}" p:url = "${mysql2.url}" p:username = "${mysql2.username}" p:password = "${mysql2.password}" /> < bean id = "multipleDataSource" class = "com.etoak.util.MultipleDataSource" > < property name = "defaultTargetDataSource" ref = "ds1" /> < property name = "targetDataSources" > < map > < entry key = "ds1" value-ref = "ds1" /> < entry key = "ds2" value-ref = "ds2" /> </ map > </ property > </ bean > < bean id = "sqlSessionFactory1" class = "org.mybatis.spring.SqlSessionFactoryBean" p:dataSource-ref = "multipleDataSource" p:mapperLocations = "classpath:com/etoak/dao/*-mapper.xml" /> < bean class = "org.mybatis.spring.mapper.MapperScannerConfigurer" > < property name = "basePackage" value = "com.etoak.dao" /> < property name = "markerInterface" value = "com.etoak.dao.BaseDao" /> </ bean > </ beans > |
测试类如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
package com.etoak.test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; import com.etoak.dao.ProductDaoIf; import com.etoak.util.MultipleDataSource; public class Test { public static void main(String[] args) { ApplicationContext ac = new FileSystemXmlApplicationContext( "WebContent/WEB-INF/etoak-servlet.xml" ); ProductDaoIf proDao = (ProductDaoIf)ac.getBean(ProductDaoIf. class ); MultipleDataSource.setDataSourceKey( "ds1" ); int count1 = proDao.selectProductCount(); MultipleDataSource.setDataSourceKey( "ds2" ); int count2 = proDao.selectProductCount(); System.out.println(count1); System.out.println(count2); } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/u012116457/article/details/50518430